| 摘要 |
A control unit (1, 1a) for a softening device (2), comprising a primary inlet (4) for untreated water, a primary outlet (7) for blended water, a sensor for determining the water hardness of the untreated water WHraw or the blended water WHblend, a secondary outlet (5), a secondary inlet (6), a bypass line (9), a blending means which can be automatically adjusted for mixing a blended water flow Vblend(t) from a first partial flow (V(t)part1soft of the secondary inlet (6) and a second partial flow V(t)part2raw of the bypass line (9), and an electronic control means (11, 11a), wherein the control means (11, 11a) is designed to readjust the adjustment position of the blending means by means of the determined water hardness in such a fashion that the water hardness in the blended water flow Vblend(t) is adjusted to a predetermined desired value, is characterized in that the control unit (1, 1a) is designed in the form of an external control unit (1, 1a) for the softening device (2), wherein the control unit (1, 1a) has a control unit housing (3), the outer side of which is provided with the primary inlet (4), the primary outlet (7), the secondary outlet (5), and the secondary inlet (6), and wherein the control unit housing (3) contains the sensor, the bypass line (9), the blending means and the electronic control means (11, 11a). The inventive control unit enables partial softening of water on the basis of fully automatic blending, thereby utilizing already existing softening devices.
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